Gr Features Supported In The Ne80E/40E - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
Name
HSB

6.1.2 GR Features Supported in the NE80E/40E

The GR features include system-level GR. System-level GR is a technology that combines
redundancy backup, GR, and HSB to implement the uninterrupted forwarding during the AMB/
SMB switchover, which minimizes the impact on services and ensures HA for devices.
Currently, the NE80E/40E supports the following GR features:
l
l
l
l
l
l
l
l
l
l
The NE80E/40E integrates the advantages of the GR and the HSB to implement the HA as
follows:
l
Issue 02 (2014-09-30)
Advantage
l The AMB/SMB switchover on the
HSB router does not affect the
service forwarding and routing
process.
l The routing information and
topology information are not lost
and the protocol session is not
interrupted during the switchover.
l The switchover between the AMB
and SMB is self-contained.
l The neighbor routers do not need to
have the GR capability.
l There is no problem of
compatibility.
l The switchover does not affect the
neighbors.
l The network convergence is faster
than the network with GR routers.
MPLS LDP (DU or DoD)
OSPF (IPv4)
IS-IS (IPv4/IPv6)
BGP (IPv4/IPv6), VPNv4 BGP, and BGP with labeled routes
RSVP
PIM-SM and PIM-SSM
OSPFv3
RIP
L3VPN
Martini VLL, PWE3 VPLS, and Martini VPLS
Provides the 1+1 backup through redundancy backup
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6 GR Configuration
Drawback
l More difficult to implement than
GR: More information, including
the protocol status, the session, the
route, the policy, and the update,
needs to be backed up.
l Usage of more communication
channel bandwidth: The HSB needs
to support the TCP backup between
the AMB and the SMB.
l Dependence on the hot backup of
the BGP/LDP session on the TCP
connection. If you do not expect the
neighbors to be aware of the
switchover, you must back up the
continuously changing TCP link
status from the AMB to the SMB.
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